Multiple-filament lamp



(No Model.)

A. L. CLOUGH. MULTLPLL PILAMBNT LAMP.

Patented July 24, 1894.

" electric lamp in which the laments may be illustrate my invention in an incandescent lighting effects, which, in the embodiment Y rooms and like places wherein the said lamp number; first, both filaments are included in they are dimly lighted; second, one filament that-both become full-y or brilliantlylighted.

,l .Y UNITED STATES' PATENT Orr-Ice.

ALBERT L. OLOUGH, OF MANCHESTER, NEW HAMPSHIRE, ASSIGNOR OF ONE-HALF TO WALTER G. CHASE, BOSTON, MASSACHUSETTS.

MULTllPlfE-FILAIVI ENT LAM P.4

SPECIFICATION forming part of Letters Patent No. 523,395, dated July 24, 1894.

Application led August 2, 1893.

To a/ZZ whom t may concern.- Y

Beit known that I, ALBERT L. CLOUGH, residing in Manchester, -in the county of Hillsborough and State of New Hampshire, have invented an Improvement in Multiple-Filament Lamps, of which the following d escrption, in connection with the accompanying drawings, is a specification, like letters and figures on the drawings representing like parts.y

This invention has for its object the production of a multiple filament incandescent illumined together in one order to produce a dim light and in another orderto produce a brilliant light or one may be separatelylighted fory purposes as lw-ill be described.

In the present instance, I have chosen tol electric lamp in which two filaments are employed, each contained in a separate globe or bulbjof any desired, usual or suitable construction. The lighting of the filaments is controlled by means of a switch constructed to effect the results desired and located in a suitable socket attached to a base to which as will be described so as to produce distinct hereiny shown of my invention, are three in the circuit in series with one another so that is cut out ofqcircuit while the other remains in circuit, and is brilliantly or fully lighted; and third, both filaments are again included, in thegcircuit in multiple with one another so The multiple filament lamp, such as above described, is especially adapted among other things to be used as a night lamp in sickmay be left dimly lighted andmay be quickly lighted to full brilliancy when needed.

These and other features of my inventionv will be pointed out in the claims at the end of this specification.

Figure l is an elevation partially broken out of one form of multiple-filament lamp embodying my invention,'the case or shell of thelampsocket being broken outjto show the sean no. 482,176. (No man.)

controlling switch; Fig. 2, an end elevation v ily comprehended. f n

Referring to Fig. l, the multipleincandeslcent electric lamp is shown as composed of `cuits to enable myinvention to be more readtwo filaments a a,in the present instance, lov cated within separate globes or bulbs a2 a3 provided with the neck pieces a4 a5 which are and may be of any usual or suitable construction, the said necks being herein shown as providedwith metal rings a6 a7, represented -in Fig. 3, and threaded Y sockets as a9 constituting terminals for the filaments a, a which terminals are electrically disconnected from each other.

The threaded terminals a8 ogare adapted to be screwed upon threaded studs or projections am am, and the terminal rings a6 a7 are adapted to co-operate and make contact with terminal rings als am attached to a base 0,15, to which is secured the socket A of the switch controlling the lighting of the filaments a a as will be described. In the present instance, the base L15 has secured to it, as by a screw am, a disk or-plate'ct17 of insulating material upon which is erected a substantially'central upright or plate alg 0f insulating material, to the opposite sides of which are secured -positive and negative terminal plates b b connected in circuit with the lilaments` as will be described.'

The disk or plate a. has erected upon it on opposite'sides of the upright o,19 standards d20 om preferably of conducting material, which form bearings for a shaft azifup'on which is fixed a cylinder or barrel o23 of insulating material, the said shaft and cylinder being posite sides ofthe upright a and adapted to respectively co-operate with the terminals b` b', one end of each spiral spring being elecroo trically secured to the shaft 0,22 and the other t 'WM-w ends of the said springs being prolonged to form arms 12 13, which are adapted to be brought into engagement with the terminals 1J 12 by the revolution of the shaft @22, effected in the usual manner by means ot a key or handle 126 of insulating material.

The upright @1g has secured to it on 011e of its faces a contact plate or terminal 117, with which the arm 12 of the spring 193 is adapted to engage as will be described, the contact or terminal 117 being electrically connected to the metallic upright @21, which may be effected by carrying the contact plate 197 down under the upright @1U and under the upright @21. The movable members b3 194 of the switch in the present embodiment of my invention, `are adapted to be turned from the normal or zero position into three operative positions with relation to the terminals 1) 1J', which positions are marked in Fig. 3 bythe numerals 1, 2, 3.

Y With the switch constructed as herein shown,

the filaments are both cut out of circuit when the arms 12, 13, are in the position marked o, Fig. 3, and the said filaments may be" both dimly lighted when the arms l2, 13, of the switches b3 124 occupy the position marked 1, and when the switch is turned so as to bring thearms 12 13 into the position marked 2 the filament will be cut out of circuit, while the filament will remain in position, filament is cut out of circuit,

circuit and will be lighted to its full brilliancy. Vhen the arms 12 13 of the movable members 192 b4 are brought into the position marked 3, both laments will at such time be in multiple with each other and will be fully lighted. y

' The terminal studs @10 @12 secured to the base ct15 are respectively electrically connected to the contact terminals 1) 19', and the terminal rings @13 @14 are respectively electrically connected to the uprights @21, @20. These connections are and may be eitected in the usual manner by means of suitable wires extended up through the base @15.

In order to enable the operation of the multiple filament lamp herein shown to be clearly understood, I have represented in dia gram in Fig. 3, the connections between the multiple switch and the terminals of the filaments disregarding the terminals @10, @12, @13, @14 on the base @15, and representing the portion of the Vcontact terminal 177, which is extended under the upright @19 and connected to the upright @21, by the wire c4.

Referring to Fig. 3, it will be noticed that the terminal a2 for the filament @is connected by wire c to the terminal or contact plate 1:, which may be regarded as the positive pole of the switch, while the negative terminal or ring @6 for the lament @is connected by wire c to the upright or standard @21. The positiveterminal a of theilament isconnected by wire c2 to the negative terminal 19 of the switch, and the negative terminal or ring @7 for the filament is connected by wire c3 to the upright or standard @20. The contact platev or terminal 127 is connected by wire c4 able member 19'l when the switch is turned into the third position, and the said terminal plate is also constructed as herein shown, so that, when the switch is turned into its second position, the arm 13 engages the said terminal.`

In the first position ofthe arms 12, 13,rep sented 'in Fig. 3, both laments @1 a are ineluded in circuit in series with each other and 'are therefore dimly lighted, the circuit for the filament being traced as follows: from the positive terminal b by wire @through the i filament to the ring @6, thence by the wire o' to the upright @21, thence by wire c4, terminal plate 137, arm l2, spring b3, upright @20,Wire c3, ring @7, lament a', and wirec2 to the negai tive terminal b.

When the switch is turned into the second while the filament remains in circuit, the

circuit for the filament being interrupted between the arm 12 and the positive terminal b, and the circuituforthe Iilam'ent @being traced as follows-from the positive termiengagement with the terminal b while the arm 12 is brought into engagement with the terminal b. In this case, both iilaments are included in circuit in multiple and are 1 lighted to their full brilliancy, the circuit of the filament being traced as follows:=from the positive terminal b, wire c through the lilament terminal ring @6, through the wire c t to upright @21, thence by arm 13 to the negative terminal b. 1

The circuit for the ilament a. with the arms 12 13 in the No. 3 position is as follows:-

from the positive terminal b, through the arm 12, member b3, upright @20, wire c3, terminal l'IO both filaments in one globe with separate terminals connected to the switch substantially in the manner shown. Furthermore, l do not desire to limit my invention to the particular number of filaments herein shown, as it may be found advantageous to increase the number of filaments and modify the construction of the switch, so that they may allbe included in series in one position of the switch or included in multiple or individually or in various groups.

1. The combination with a multiple lament incandescent electric lamp having each lament provided with independent terminals electrically disconnected from the terminals of the other filaments, of a switch provided With line terminals and with a terminal separate from the line terminals, and means to co-operate with said terminals and with the separate terminals of each filament to connect in the line circuit each filament individually and also the said laments c ollectively in series kand in multiple, substantially as described.

2. In amultiple lilamentincandescent electric lamp, the combination with a base provided with a plurality of terminals, and a plurality of filament. containing globes or bulbs lov with separate terminals, of a switch provided with line terminals, an independent terminal 67, and movable members co-operating with said terminals, substantially as described.

4. A switch for multiple filament incandescent electric lamps, consisting of line terminals, an vindependent terminal 67, andmovable members co-operating with said terminals, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ALBERT L, oLoUcH.

Witnesses:

L B. CLOUGH, F. l C. kTWOMBLY. 

